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| Name | Class |
|---|---|
| Institut Paoli Calmettes, Marseille | UNKNOWN |
| Hôpital Necker-Enfants Malades | OTHER |
| University Hospital, Lille | OTHER |
| Hopital Lariboisière |
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Spectral computed tomography or dual-energy CT imaging can overcome the limitations of conventional CT in differentiating between two materials with equivalent total attenuation. It can generate several types of images, such as virtual monochromatic images, which improve the contrast-to-noise ratio for low energy levels and reduce artifacts for high energy levels. It also allows for quantitative image analysis and thus better characterization of lesions and tissues through material mapping (e.g., iodinated contrast agent mapping). This technique is increasingly used in routine clinical practice thanks to improvements in image flow management and technological advances. It also involves exposing patients to ionizing radiation, as with conventional CT but, unlike conventional CT scans, for which dosimetric reference levels (RLs) are defined for the most common examinations in France (RL decree dated 2019), there are currently no dosimetric reference levels for examinations performed using this technique. Yet RLs are an important and effective tools for optimizing patient exposure to ionizing radiation. Several articles were published between 2012 and 2017 when the first dual-energy scanners arrived in clinics. However, the results presented in these studies are now far removed from recent practices, as they do not take into account the latest technological developments used in dual-energy scanners, which reduce X-ray doses.
The main objective of the study is to define dosimetric reference levels for the most commonly performed spectral computed tomography examinations in France.
Spectral computed tomography (CT) (or dual-energy CT) imaging can overcome the limitations of conventional CT in differentiating between two materials with equivalent total attenuation. It can generate several types of images, such as virtual monochromatic images, which improve the contrast-to-noise ratio for low energy levels and reduce artifacts for high energy levels. It also allows for quantitative image analysis and thus better characterization of lesions and tissues through material mapping (e.g., iodinated contrast agent mapping). This technique is increasingly used in routine clinical practice thanks to improvements in image flow management and technological advances. It also involves exposing patients to ionizing radiation, as with conventional CT.
However, unlike conventional CT scans, for which dosimetric reference levels (RLs) are defined for the most common examinations in France (RL decree dated 2019), there are currently no dosimetric reference levels for examinations performed using this technique. Yet the RL is an important and effective tool in optimizing patient exposure to ionizing radiation. In fact, a number of articles were published between 2012 and 2017, when the first dual-energy scanners arrived in clinics. However, the results presented in these studies are now far removed from recent practices, as they do not take into account the latest technological developments used in dual-energy scanners, which reduce X-ray doses.
The main objective of the study is to define dosimetric reference levels for the most frequently performed spectral computed tomography examinations in France:
The secondary objectives of the study are to evaluate, for each examination performed:
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Patients undergoing a maximum number of 18 spectral CT scans among the examinations mentioned below | Patients undergoing a maximum number of 18 spectral CT scans among the examinations mentioned below:
|
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Spectral ComputedTomography | Radiation | Commonly performed spectral computed tomography examinations in France |
|
| Measure | Description | Time Frame |
|---|---|---|
| Dosimetric reference levels for spectral computed tomography examinations in France: Chest CT for pulmonary embolism. CTDIvol | Computed tomography dose index (CTDIvol) per acquisition expressed in milligray (mGy). | Periprocedural |
| Dosimetric reference levels for spectral computed tomography examinations in France: Chest CT for pulmonary embolism. DLP | Dose length product (DLP) expressed in mGy.cm | Periprocedural |
| Dosimetric reference levels for spectral computed tomography examinations in France: Chest CT for other indications. CTDIvol | Computed tomography dose index (CTDIvol) per acquisition expressed in milligray (mGy). | Periprocedural |
| Dosimetric reference levels for spectral computed tomography examinations in France: Chest CT for other indications. DLP | Dose length product (DLP) expressed in mGy.cm | Periprocedural |
| Dosimetric reference levels for spectral computed tomography examinations in France: Coronary CT with contrast injection and retrospective gating. CTDIvol | Computed tomography dose index (CTDIvol) per acquisition expressed in milligray (mGy). | Periprocedural |
| Dosimetric reference levels for spectral computed tomography examinations in France: Coronary CT with contrast injection and prospective gating. DLP | Dose length product (DLP) expressed in mGy.cm | Periprocedural |
| Dosimetric reference levels for spectral computed tomography examinations in France: Cranial CT with contrast injection. CTDIvol |
| Measure | Description | Time Frame |
|---|---|---|
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Chest CT for pulmonary embolism. Acquisition type | The type of acquisition will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Chest CT for pulmonary embolism. Number of acquisitions |
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Inclusion Criteria:
Exclusion Criteria:
- Pregnant women
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All adult patients who underwent a spectral CT scan between January 1, 2023, and August 31, 2024, as part of their treatment.
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| Name | Affiliation | Role |
|---|---|---|
| Joël GREFFIER | Nîmes University Hospital | Study Chair |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Nîmes University Hospital | Nîmes | Gard | 30029 | France |
| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 23097163 | Background | Henzler T, Fink C, Schoenberg SO, Schoepf UJ. Dual-energy CT: radiation dose aspects. AJR Am J Roentgenol. 2012 Nov;199(5 Suppl):S16-25. doi: 10.2214/AJR.12.9210. | |
| 32373363 | Background | Ghasemi Shayan R, Oladghaffari M, Sajjadian F, Fazel Ghaziyani M. Image Quality and Dose Comparison of Single-Energy CT (SECT) and Dual-Energy CT (DECT). Radiol Res Pract. 2020 Apr 20;2020:1403957. doi: 10.1155/2020/1403957. eCollection 2020. |
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| OTHER |
| Centre Hospitalier Universitaire de Saint Etienne | OTHER |
| Saint-Louis Hospital, Paris, France | OTHER |
| Bichat Hospital | OTHER |
| Hôpital Louis Mourier, 92700 Colombes | UNKNOWN |
| Centre Hospitalier de Valenciennes | NETWORK |
| Hopital Louis Pradel | OTHER |
| Centre Léon Bérard, Lyon | UNKNOWN |
| University Hospital, Bordeaux | OTHER |
| Centre Hospitalier Lyon Sud | OTHER |
| Institut Curie | OTHER |
| Amiens University Hospital | OTHER |
| Poitiers University Hospital | OTHER |
| Henri Mondor Hospital, Créteil | UNKNOWN |
| Saint Antoine University Hospital | OTHER |
| Nord Ardennes Intercommunal Hospital | UNKNOWN |
| Centre Antoine Lacassagne, Nice | UNKNOWN |
| Hôpital Edouard Herriot (GH Centre), Lyon | UNKNOWN |
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Computed tomography dose index (CTDIvol) per acquisition expressed in milligray (mGy). |
| Periprocedural |
| Dosimetric reference levels for spectral computed tomography examinations in France: Cranial CT with contrast injection. DLP | Dose length product (DLP) expressed in mGy.cm | Periprocedural |
| Dosimetric reference levels for spectral computed tomography examinations in France: Supra-aortic trunk CT. CTDIvol | Computed tomography dose index (CTDIvol) per acquisition expressed in milligray (mGy). | Periprocedural |
| Dosimetric reference levels for spectral computed tomography examinations in France: Supra-aortic trunk CT. DLP | Dose length product (DLP) expressed in mGy.cm | Periprocedural |
| Dosimetric reference levels for spectral computed tomography examinations in France: Neck and ear,nose and throat sphere CT with contrast injection. CTDIvol | Computed tomography dose index (CTDIvol) per acquisition expressed in milligray (mGy). | Periprocedural |
| Dosimetric reference levels for spectral computed tomography examinations in France: Neck and ear,nose and throat sphere CT with contrast injection. DLP | Dose length product (DLP) expressed in mGy.cm | Periprocedural |
| Dosimetric reference levels for spectral computed tomography examinations in France: Oncological abdomen-pelvis CT scan. CTDIvol | Computed tomography dose index (CTDIvol) per acquisition expressed in milligray (mGy). | Periprocedural |
| Dosimetric reference levels for spectral computed tomography examinations in France: Oncological abdomen-pelvis CT scan. DLP | Dose length product (DLP) expressed in mGy.cm | Periprocedural |
| Dosimetric reference levels for spectral computed tomography examinations in France: Abdomen-pelvis CT scan to check for kidney stones. CTDIvol | Computed tomography dose index (CTDIvol) per acquisition expressed in milligray (mGy). | Periprocedural |
| Dosimetric reference levels for spectral computed tomography examinations in France: Abdomen-pelvis CT scan to check for kidney stones. DLP | Dose length product (DLP) expressed in mGy.cm | Periprocedural |
| Dosimetric reference levels for spectral computed tomography examinations in France: Abdomen-pelvis CT scan for non-oncological purposes and to check for kidney stones. CTDIvol | Computed tomography dose index (CTDIvol) per acquisition expressed in milligray (mGy). | Periprocedural |
| Dosimetric reference levels for spectral computed tomography examinations in France: Abdomen-pelvis CT scan for non-oncological purposes and to check for kidney stones. DLP | Dose length product (DLP) expressed in mGy.cm | Periprocedural |
| Dosimetric reference levels for spectral computed tomography examinations in France: Oncological chest-abdomen-pelvis CT scan. CTDIvol | Computed tomography dose index (CTDIvol) per acquisition expressed in milligray (mGy). | Periprocedural |
| Dosimetric reference levels for spectral computed tomography examinations in France: Oncological chest-abdomen-pelvis CT scan. DLP | Dose length product (DLP) expressed in mGy.cm | Periprocedural |
| Dosimetric reference levels for spectral computed tomography examinations in France: Non-oncological chest-abdomen-pelvis CT scan. CTDIvol | Computed tomography dose index (CTDIvol) per acquisition expressed in milligray (mGy). | Periprocedural |
| Dosimetric reference levels for spectral computed tomography examinations in France: Non-oncological chest-abdomen-pelvis CT scan. DLP | Dose length product (DLP) expressed in mGy.cm | Periprocedural |
| Dosimetric reference levels for spectral computed tomography examinations in France: Oncological chest-abdomen CT scan. CTDIvol | Computed tomography dose index (CTDIvol) per acquisition expressed in milligray (mGy). | Periprocedural |
| Dosimetric reference levels for spectral computed tomography examinations in France: Oncological chest-abdomen CT scan. DLP | Dose length product (DLP) expressed in mGy.cm | Periprocedural |
| Dosimetric reference levels for spectral computed tomography examinations in France: Non-oncological chest-abdomen CT scan. CTDIvol | Computed tomography dose index (CTDIvol) per acquisition expressed in milligray (mGy). | Periprocedural |
| Dosimetric reference levels for spectral computed tomography examinations in France: Non-oncological chest-abdomen CT scan. DLP | Dose length product (DLP) expressed in mGy.cm | Periprocedural |
| Dosimetric reference levels for spectral computed tomography examinations in France: Lower limb angiography. CTDIvol | Computed tomography dose index (CTDIvol) per acquisition expressed in milligray (mGy). | Periprocedural |
| Dosimetric reference levels for spectral computed tomography examinations in France: Lower limb angiography. DLP | Dose length product (DLP) expressed in mGy.cm | Periprocedural |
| Dosimetric reference levels for spectral computed tomography examinations in France: Cervical spine CT scan. CTDIvol | Computed tomography dose index (CTDIvol) per acquisition expressed in milligray (mGy). | Periprocedural |
| Dosimetric reference levels for spectral computed tomography examinations in France: Cervical spine CT scan. DLP | Dose length product (DLP) expressed in mGy.cm | Periprocedural |
| Dosimetric reference levels for spectral computed tomography examinations in France: Thoracic spine CT scan. CTDIvol | Computed tomography dose index (CTDIvol) per acquisition expressed in milligray (mGy). | Periprocedural |
| Dosimetric reference levels for spectral computed tomography examinations in France: Thoracic spine CT scan. DLP | Dose length product (DLP) expressed in mGy.cm | Periprocedural |
| Dosimetric reference levels for spectral computed tomography examinations in France: Lumbar spine CT scan. CTDIvol | Computed tomography dose index (CTDIvol) per acquisition expressed in milligray (mGy). | Periprocedural |
| Dosimetric reference levels for spectral computed tomography examinations in France: Lumbar spine CT scan. DLP | Dose length product (DLP) expressed in mGy.cm | Periprocedural |
| Dosimetric reference levels for spectral computed tomography examinations in France: Pelvis CT scan. CTDIvol | Computed tomography dose index (CTDIvol) per acquisition expressed in milligray (mGy). | Periprocedural |
| Dosimetric reference levels for spectral computed tomography examinations in France: Pelvis CT scan. DLP | Dose length product (DLP) expressed in mGy.cm | Periprocedural |
| Dosimetric reference levels for spectral computed tomography examinations in France: Extremities CT scan. CTDIvol | Computed tomography dose index (CTDIvol) per acquisition expressed in milligray (mGy). | Periprocedural |
| Dosimetric reference levels for spectral computed tomography examinations in France: Extremities CT scan. DLP | Dose length product (DLP) expressed in mGy.cm will be recorded | Periprocedural |
The number of acquisitions will be recorded. |
| Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Chest CT for pulmonary embolism. CTDIvol | The dose (CTDIvol) will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Chest CT for pulmonary embolism. DLP | Dose length product (DLP) expressed in mGy.cm will be recorded. | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients: Chest CT for pulmonary embolism. BMI | Weight and height will be combined to report BMI in kg/m^2 | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients: Chest CT for pulmonary embolism. Acquisition parameters, kV | Acquisition parameters (kV) will be recorded | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients: Chest CT for pulmonary embolism. Acquisition parameters, mAs | Acquisition parameters (mAs) will be recorded | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients: Chest CT for pulmonary embolism. Acquisition parameters. Rotation time | Rotation time will be recorded in seconds | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients: Chest CT for pulmonary embolism. Acquisition parameters. Helical pitch | Helical pitch will be recorded as a ratio. This represents the relationship between patient couch movement and X-ray beam width. It is the distance travelled by the table during one 360 degree gantry rotation divided by the collimated section thickness | Periprocedural |
| Impact of reconstruction algorithms on the dose delivered to patients : Chest CT for pulmonary embolism. Type of reconstruction algorithm | The type of reconstruction algorithm (iterative or deep learning) will be recorded | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Chest CT for other indications. Acquisition type | The type of acquisition will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Chest CT for other indications. Number of acquisitions | The number of acquisitions will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Chest CT for other indications. CTDIvol | The dose (CTDIvol) will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Chest CT for other indications. DLP | The dose length product (DLP) expressed in mGy.cm will be recorded. | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients: Chest CT for other indications. BMI | Weight and height will be combined to report BMI in kg/m^2 | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients: Chest CT for other indications. Acquisition parameters, kV | Acquisition parameters (kV) will be recorded | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients: Chest CT for other indications. Acquisition parameters, mAs | Acquisition parameters (mAs) will be recorded | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients: Chest CT for other indications. Acquisition parameters, rotation time | Rotation time will be recorded in seconds | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients: Chest CT for other indications. Acquisition parameters, helical pitch | Helical pitch time will be recorded as a ratio. This represents the relationship between patient couch movement and X-ray beam width. It is the distance travelled by the table during one 360 degree gantry rotation divided by the collimated section thickness | Periprocedural |
| Impact of reconstruction algorithms on the dose delivered to patients : Chest CT for other indications. Type of reconstruction algorithm | The type of reconstruction algorithm (iterative or deep learning) will be recorded | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Coronary CT with contrast injection and retrospective gating. Acquisition type | The type of acquisition will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Coronary CT with contrast injection and retrospective gating. Number of acquisitions | The number of acquisitions will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Coronary CT with contrast injection and retrospective gating. CTDIvol | The dose (CTDIvol) will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Coronary CT with contrast injection and retrospective gating. DLP | The dose length product (DLP) will be recorded. | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Coronary CT with contrast injection and retrospective gating. BMI | Weight and height will be combined to report BMI in kg/m^2 | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Coronary CT with contrast injection and retrospective gating. Acquisition parameters, kV | Acquisition parameters (kV) will be recorded | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Coronary CT with contrast injection and retrospective gating. Acquisition parameters, mAs | Acquisition parameters (mAs) will be recorded | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Coronary CT with contrast injection and retrospective gating. Rotation time | Rotation time will be recorded in seconds | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Coronary CT with contrast injection and retrospective gating. Helical pitch | Helical pitch will be recorded as a ratio. This represents the relationship between patient couch movement and X-ray beam width. It is the distance travelled by the table during one 360 degree gantry rotation divided by the collimated section thickness | Periprocedural |
| Impact of reconstruction algorithms on the dose delivered to patients : Coronary CT with contrast injection and retrospective gating. Type of reconstruction algorithm | The type of reconstruction algorithm (iterative or deep learning) will be recorded | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Cranial CT with contrast injection. Acquisition type | The type of acquisition will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Cranial CT with contrast injection. Number of acquisitions | The number of acquisitions will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Cranial CT with contrast injection. CTDIvol | The dose (CTDIvol) will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Cranial CT with contrast injection. DLP | Dose length product (DLP) will be recorded. | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients: Cranial CT with contrast injection. BMI | Weight and height will be combined to report BMI in kg/m^2 | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients: Cranial CT with contrast injection. Acquisition parameters, kV | Acquisition parameters (kV)will be recorded | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients: Cranial CT with contrast injection. Acquisition parameters, mAs | Acquisition parameters (mAs) will be recorded | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients: Cranial CT with contrast injection. Rotation time | Rotation time will be recorded in seconds | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients: Cranial CT with contrast injection. Helical pitch | Helical pitch will be recorded as a ratio. This represents the relationship between patient couch movement and X-ray beam width. It is the distance travelled by the table during one 360 degree gantry rotation divided by the collimated section thickness | Periprocedural |
| Impact of reconstruction algorithms on the dose delivered to patients : Cranial CT with contrast injection. Type of reconstruction algorithm | The type of reconstruction algorithm (iterative or deep learning) will be recorded | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Supra-aortic trunk CT. Acquisition type | The type of acquisition will be recorded | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Supra-aortic trunk CT. Number of acquisitions | The number of acquisitions will be recorded | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Supra-aortic trunk CT. CTDIvol | The dose (CTDIvol) will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Supra-aortic trunk CT. DLP | The dose (DLP) expressed in mGy.cm will be recorded. | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Supra-aortic trunk CT. BMI | Weight and height will be combined to report BMI in kg/m^2 | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Supra-aortic trunk CT. Acquisition parameters. kV | Acquisition parameters (kV) will be recorded | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Supra-aortic trunk CT. Acquisition parameters. mAs | Acquisition parameters (mAs) will be recorded | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Supra-aortic trunk CT. Acquisition parameters. Rotation time | Rotation time will be recorded in seconds | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Supra-aortic trunk CT. Acquisition parameters. Helical pitch | Helical pitch will be recorded as a ratio. This represents the relationship between patient couch movement and X-ray beam width. It is the distance travelled by the table during one 360 degree gantry rotation divided by the collimated section thickness | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Neck and ear, nose and throat sphere CT with contrast injection. Acquisition type | The type of acquisition will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Neck and ear, nose and throat sphere CT with contrast injection. Number of acquisitions | The number of acquisitions will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Neck and ear, nose and throat sphere CT with contrast injection. CTDIvol | The dose (CTDIvol) will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Neck and ear, nose and throat sphere CT with contrast injection. DLP | The dose (DLP) expressed in mGy.cm will be recorded | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Neck and ear, nose and throat sphere CT with contrast injection. BMI | Weight and height will be combined to report BMI in kg/m^2 | Periprocedural |
| Impact of reconstruction algorithms on the dose delivered to patients : Neck and ear, nose and throat sphere CT with contrast injection. Type of reconstruction algorithm | The type of reconstruction algorithm (iterative or deep learning) will be recorded | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Oncological abdomen-pelvis CT scan. Acquisition type | The type of acquisitions will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Oncological abdomen-pelvis CT scan. Number of acquisitions | The number of acquisitions will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Oncological abdomen-pelvis CT scan. CTDIvol | The dose (CDTIvol) will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Oncological abdomen-pelvis CT scan. DLP | The dose length product (DLP) expressed in mGy.cm will be recorded | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Oncological abdomen-pelvis CT scan. BMI | Weight and height will be combined to report BMI in kg/m^2 | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Oncological abdomen-pelvis CT scan. Acquisition parameters (kV) | Acquisition parameters (kV) will be recorded | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Oncological abdomen-pelvis CT scan. Acquisition parameters (mAs) | Acquisition parameters (mAs) will be recorded | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Oncological abdomen-pelvis CT scan. Acquisition parameters. Rotation time | Rotation time will be recorded in seconds | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Oncological abdomen-pelvis CT scan. Acquisition parameters. Helical pitch | Helical pitch will be recorded will be recorded as a ratio. This represents the relationship between patient couch movement and X-ray beam width. It is the distance travelled by the table during one 360 degree gantry rotation divided by the collimated section thickness | Periprocedural |
| Impact of reconstruction algorithms on the dose delivered to patients: Oncological abdomen-pelvis CT scan. Type of reconstruction algorithm | The type of reconstruction algorithm (iterative or deep learning) will be recorded | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Abdomen-pelvis CT scan to check for kidney stones. Acquisition type an | The type of acquisition will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Abdomen-pelvis CT scan to check for kidney stones. Number of acquisitions an | The number of acquisitions will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Abdomen-pelvis CT scan to check for kidney stones. CTDIvol an | The dose (CDTIvol) will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Abdomen-pelvis CT scan to check for kidney stones. DLP an | The dose length product (DLP) expressed in mGy.cm will be recorded. | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Abdomen-pelvis CT scan to check for kidney stones. BMI an | Weight and height will be combined to report BMI in kg/m^2 | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Abdomen-pelvis CT scan to check for kidney stones. Acquisition parameters. Kv an | Acquisition parameters (kV) will be recorded | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Abdomen-pelvis CT scan to check for kidney stones. Acquisition parameters. mAs an | Acquisition parameters (mAs) will be recorded | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Abdomen-pelvis CT scan to check for kidney stones. Rotation time an | Rotation time will be recorded in seconds | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Abdomen-pelvis CT scan to check for kidney stones. Helical pitch an | Helical pitch will be recorded as a ratio. This represents the relationship between patient couch movement and X-ray beam width. It is the distance travelled by the table during one 360 degree gantry rotation divided by the collimated section thickness | Periprocedural |
| Impact of reconstruction algorithms on the dose delivered to patients : Abdomen-pelvis CT scan to check for kidney stones. Type of reconstruction algorithm an | The type of reconstruction algorithm (iterative or deep learning) will be recorded | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Abdomen-pelvis CT scan for non-oncological purposes and to check for kidney stones. Acquisition type | The type of acquisition will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Abdomen-pelvis CT scan for non-oncological purposes and to check for kidney stones. Number of acquisitions | The number of acquisitions will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Abdomen-pelvis CT scan for non-oncological purposes and to check for kidney stones. CTDIvol | The dose (CTDIvol) will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Abdomen-pelvis CT scan for non-oncological purposes and to check for kidney stones. DLP | The dose length product (DLP) expressed in mGy.cm will be recorded. | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Abdomen-pelvis CT scan for non-oncological purposes and to check for kidney stones. BMI | Weight and height will be combined to report BMI in kg/m^2 | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Abdomen-pelvis CT scan for non-oncological purposes and to check for kidney stones. Acquisition parameters. kV | Acquisition parameters (kV) will be recorded | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Abdomen-pelvis CT scan for non-oncological purposes and to check for kidney stones. Acquisition parameters. mAs | Acquisition parameters (mAs) will be recorded | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Abdomen-pelvis CT scan for non-oncological purposes and to check for kidney stones. Rotation time | Rotation time will be recorded in seconds | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Abdomen-pelvis CT scan for non-oncological purposes and to check for kidney stones. Helical pitch | Helical pitch will be recorded as a ratio. This represents the relationship between patient couch movement and X-ray beam width. It is the distance travelled by the table during one 360 degree gantry rotation divided by the collimated section thickness | Periprocedural |
| Impact of reconstruction algorithms on the dose delivered to patients : Abdomen-pelvis CT scan for non-oncological purposes and to check for kidney stones. Type of reconstruction algorithm | The type of reconstruction algorithm (iterative or deep learning) will be recorded | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Oncological chest-abdomen-pelvis CT scan. Acquisition type | The type of acquisition will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Oncological chest-abdomen-pelvis CT scan. Number of acquisitions | The number of acquisitions will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Oncological chest-abdomen-pelvis CT scan. CTDIvol | The dose (CDTIvol) will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Oncological chest-abdomen-pelvis CT scan. DLP | The dose (DLP) expressed in mGy.cm will be recorded. | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Oncological chest-abdomen-pelvis CT scan. BMI | Weight and height will be combined to report BMI in kg/m^2 | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Oncological chest-abdomen-pelvis CT scan. Acquisition parameters. kV | Acquisition parameters (kV) will be recorded | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Oncological chest-abdomen-pelvis CT scan. Acquisition parameters. mAs | Acquisition parameters (mAs) will be recorded | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Oncological chest-abdomen-pelvis CT scan. Rotation time | Rotation time will be recorded in seconds | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Oncological chest-abdomen-pelvis CT scan. Helical pitch | Helical pitch will be recorded as a ratio. This represents the relationship between patient couch movement and X-ray beam width. It is the distance travelled by the table during one 360 degree gantry rotation divided by the collimated section thickness | Periprocedural |
| Impact of reconstruction algorithms on the dose delivered to patients : Oncological chest-abdomen-pelvis CT scan. Type of reconstruction algorithm | The type of reconstruction algorithm (iterative or deep learning) will be recorded | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Non-oncological chest-abdomen-pelvis CT scan. Acquisition type. | The type of acquisition will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Non-oncological chest-abdomen-pelvis CT scan. Number of acquisitions. | The number of acquisitions will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Non-oncological chest-abdomen-pelvis CT scan. CDTIvol | The dose (CTDIvol) will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Non-oncological chest-abdomen-pelvis CT scan. CDTIvol. DLP | The dose length product (DLP) expressed in mGy.cm will be recorded. | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Non-oncological chest-abdomen-pelvis CT scan. BMI | Weight and height will be combined to report BMI in kg/m^2 | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Non-oncological chest-abdomen-pelvis CT scan. Acquisition parameters. kV | Acquisition parameters (kV) will be recorded | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Non-oncological chest-abdomen-pelvis CT scan. Acquisition parameters. mAs | Acquisition parameters (mAs) will be recorded | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Non-oncological chest-abdomen-pelvis CT scan. Acquisition parameters. Rotation time | Rotation time will be recorded in seconds | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Non-oncological chest-abdomen-pelvis CT scan. Acquisition parameters. Helical pitch | Helical pitch will be recorded as a ratio. This represents the relationship between patient couch movement and X-ray beam width. It is the distance travelled by the table during one 360 degree gantry rotation divided by the collimated section thickness | Periprocedural |
| Impact of reconstruction algorithms on the dose delivered to patients : Non-oncological chest-abdomen-pelvis CT scan. Type of reconstruction algorithm | The type of reconstruction algorithm (iterative or deep learning) will be recorded | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Oncological chest-abdomen CT scan. Aquisition type | The type of acquisitions will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Oncological chest-abdomen CT scan. Number of aquisitions | The number of acquisitions will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Oncological chest-abdomen CT scan. CTDIvol | The dose (CTDIvol) will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Oncological chest-abdomen CT scan. DLP | The dose length product (DLP) expressed in mGy.cm will be recorded. | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Oncological chest-abdomen CT scan. BMI | Weight and height will be combined to report BMI in kg/m^2 | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Oncological chest-abdomen CT scan. Acquisition parameters (kV) | Acquisition parameters (kV) will be recorded | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Oncological chest-abdomen CT scan. Acquisition parameters (mAs) | Acquisition parameters (mAs) will be recorded | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Oncological chest-abdomen CT scan. Rotation time | Rotation time will be recorded in seconds | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Oncological chest-abdomen CT scan. Helical pitch | Helical pitch will be recorded as a ratio. This represents the relationship between patient couch movement and X-ray beam width. It is the distance travelled by the table during one 360 degree gantry rotation divided by the collimated section thickness | Periprocedural |
| Impact of reconstruction algorithms on the dose delivered to patients : Oncological chest-abdomen CT scan. Type of reconstruction algorithm | The type of reconstruction algorithm (iterative or deep learning) will be recorded | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Non-oncological chest-abdomen CT scan. Acquisition type | The type of acquisition will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Non-oncological chest-abdomen CT scan. Number of acquisitions | The number of acquisitions will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Non-oncological chest-abdomen CT scan. CTDIvol | The dose (CDTIvol) will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Non-oncological chest-abdomen CT scan. DLP | The dose length product (DLP) expressed in mGy.cm will be recorded. | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Non-oncological chest-abdomen CT scan | Weight and height will be combined to report BMI in kg/m^2 | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Non-oncological chest-abdomen CT scan. Acquisition parameters. kV | Acquisition parameters (kV) will be recorded | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Non-oncological chest-abdomen CT scan. Acquisition parameters. mAs | Acquisition parameters (mAs) will be recorded | Periprocedural |
| Impact of reconstruction algorithms on the dose delivered to patients: Non-oncological chest-abdomen CT scan. Type of reconstruction algorithm | The type of reconstruction algorithm (iterative or deep learning) will be recorded | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Lower limb angiography. Acquisition type | The type of acquisition will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Lower limb angiography. Number of acquitions | The number of acquisitions will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Lower limb angiography. CTDIvol | The dose CDTIvol) will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Lower limb angiography. DLP | The dose length product (DLP) expressed in mGy.cm will be recorded. | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Lower limb angiography. BMI | Weight and height will be combined to report BMI in kg/m^2 | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Lower limb angiography. Acquisition parameters. kV | Acquisition parameters (kV) will be recorded | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Lower limb angiography. Acquisition parameters. mAs | Acquisition parameters (mAs) will be recorded | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Lower limb angiography. Rotation time | Rotation time will be recorded in seconds. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Lower limb angiography. Helical pitch | Helical pitch will be recorded as a ratio.This represents the relationship between patient couch movement and X-ray beam width. It is the distance travelled by the table during one 360 degree gantry rotation divided by the collimated section thickness | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Lower limb angiography. Type of reconstruction algorithm | Type of reconstruction algorithm (iterative or deep learning) will be recorded | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Cervical spine CT scan. Acquisition type | The type of acquisition will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Cervical spine CT scan. Number of acquisitions | The number of acquisitions will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Cervical spine CT scan. CDTIvol | The dose (CDTIvol) will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Cervical spine CT scan. DLP | The dose length product (DLP) expressed in mGy.cm will be recorded. | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Cervical spine CT scan. BMI | Weight and height will be combined to report BMI in kg/m^2 | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Cervical spine CT scan. Acquisition parameters. kV | Acquisition parameters (kV) will be recorded | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Cervical spine CT scan. Acquisition parameters. mAs | Acquisition parameters (mAs) will be recorded | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Cervical spine CT scan. Acquisition parameters. Rotation time | Rotation time will be recorded in seconds | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Cervical spine CT scan. Acquisition parameters. Helical pitch | Helical pitch will be recorded as a ratio. This represents the relationship between patient couch movement and X-ray beam width. It is the distance travelled by the table during one 360 degree gantry rotation divided by the collimated section thickness | Periprocedural |
| Impact of reconstruction algorithms on the dose delivered to patients : Cervical spine CT scan. Type of reconstruction algorithm | The type of reconstruction algorithm (iterative or deep learning) will be recorded | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Thoracic spine CT scan. Acquisition type | The type of acquisition will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Thoracic spine CT scan. Number of acquisitions | The number of acquisition will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Thoracic spine CT scan. CTDIvol | The dose (CDTIvol) will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Thoracic spine CT scan. DLP | The dose length product (DLP) expressed in mGy.cm will be recorded. | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Thoracic spine CT scan. BMI | Weight and height will be combined to report BMI in kg/m^2 | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Thoracic spine CT scan. Acquisition parameters (kV) | Acquisition parameters (kV) will be recorded | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Thoracic spine CT scan. Acquisition parameters (mAs) | Acquisition parameters (mAs) will be recorded | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Thoracic spine CT scan. Rotation time | Rotation time will be recorded in seconds | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Thoracic spine CT scan. Helical pitch | Helical pitch will be recorded as a ratio. This represents the relationship between patient couch movement and X-ray beam width. It is the distance travelled by the table during one 360 degree gantry rotation divided by the collimated section thickness | Periprocedural |
| Impact of reconstruction algorithms on the dose delivered to patients : Thoracic spine CT scan. Type of reconstruction algorithm | The type of reconstruction algorithm (iterative or deep learning) will be recorded | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Lumbar spine CT scan. Acquisition type | The type of acquisition will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Lumbar spine CT scan. Number of acquisitions | The number of acquisition will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Lumbar spine CT scan. CTDIvol | The dose (CDTIvol) will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Lumbar spine CT scan. DLP | The dose length product (DLP) expressed in mGy.cm will be recorded | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Lumbar spine CT scan. BMI | Weight and height will be combined to report BMI in kg/m^2 | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Lumbar spine CT scan. Acquisition parameters. kV | Acquisition parameters (kV) will be recorded | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Lumbar spine CT scan. Acquisition parameters. mAs | Acquisition parameters (mAs) will be recorded | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Lumbar spine CT scan. Acquisition parameters. Rotation time | Rotation time will be recorded in seconds | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Lumbar spine CT scan. Acquisition parameters. Helical pitch | Helical pitch will be recorded as a ratio. This represents the relationship between patient couch movement and X-ray beam width. It is the distance travelled by the table during one 360 degree gantry rotation divided by the collimated section thickness | Periprocedural |
| Impact of reconstruction algorithms on the dose delivered to patients: Lumbar spine CT scan. Type of reconstruction algorithm | The type of reconstruction algorithm (iterative or deep learning) will be recorded | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Pelvis CT scan. Acquisition type | The type of acquisition will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Pelvis CT scan. Number of acquisitions | The number of acquisitions will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Pelvis CT scan. CTDIvol | The dose (CDTIvol) will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Pelvis CT scan. DLP | The dose length product (DLP) expressed in mGy.cm will be recorded. | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Pelvis CT scan. BMI. | Weight and height will be combined to report BMI in kg/m^2 | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Pelvis CT scan. Acquistion parameters. kV | Acquisition parameters (kV) will be recorded | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Pelvis CT scan. Acquistion parameters. mAs | Acquisition parameters (mAs) will be recorded | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Pelvis CT scan. Acquistion parameters. Rotation time | Rotation time will be recorded in seconds | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Pelvis CT scan. Acquistion parameters. Helical pitch | Helical pitch will be recorded as a ratio. This represents the relationship between patient couch movement and X-ray beam width. It is the distance travelled by the table during one 360 degree gantry rotation divided by the collimated section thickness | Periprocedural |
| Impact of reconstruction algorithms on the dose delivered to patients : Pelvis CT scan. Type of reconstruction algorithm | The type of reconstruction algorithm (iterative or deep learning) will be recorded | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Extremities CT scan. Acquisition type | The type of acquisition will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Extremities CT scan. Number of acquisitions | The number of acquisitions will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Extremities CT scan. CTDIvol | The dose (CTDIvol) will be recorded. | Periprocedural |
| Impact of the spectral acquisition/detection technique on the dose delivered to patients: Extremities CT scan. DLP | The dose length product (DLP) expressed in mGy.cm will be recorded | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Extremities CT scan. BMI | Weight in kg and height in cm in will be combined to report BMI in kg/m^2 | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Extremities CT scan. Acquisition parameters. kV | Acquisition parameters (kV) will be recorded | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Extremities CT scan. Acquisition parameters. mAs | Acquisition parameters (mAs) will be recorded | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Extremities CT scan. Acquisition parameters. Rotation time | Rotation time will be recorded in seconds | Periprocedural |
| Impact of patients' BMI on the dose delivered to patients : Extremities CT scan. Acquisition parameters. Helical pitch | Helical pitch will be recorded as a ratio. This represents the relationship between patient couch movement and X-ray beam width. It is the distance travelled by the table during one 360 degree gantry rotation divided by the collimated section thickness | Periprocedural |
| Impact of reconstruction algorithms on the dose delivered to patients: Extremities CT scan. Type of reconstruction algorithm | The type of reconstruction algorithm (iterative or deep learning) will be recorded | Periprocedural |
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